/*
 * Copyright 2024 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package com.linqingying.cangjie.types.expressions

import com.linqingying.cangjie.config.LanguageVersionSettings
import com.linqingying.cangjie.descriptors.BindingTrace
import com.linqingying.cangjie.psi.CjTypeStatement
import com.linqingying.cangjie.psi.CjDeclaration
import com.linqingying.cangjie.psi.CjExpression
import com.linqingying.cangjie.psi.psiUtil.getStrictParentOfType

import com.linqingying.cangjie.resolve.BindingContext
import com.linqingying.cangjie.psi.psiUtil.parentsWithSelf

class PreliminaryDeclarationVisitor(
    val declaration: CjDeclaration,
    val languageVersionSettings: LanguageVersionSettings
) : AssignedVariablesSearcher() {


    companion object {

        fun createForExpression(
            expression: CjExpression,
            trace: BindingTrace,
            languageVersionSettings: LanguageVersionSettings
        ) {
            expression.getStrictParentOfType<CjDeclaration>()
                ?.let { createForDeclaration(it, trace, languageVersionSettings) }
        }

        private fun topMostNonClassDeclaration(declaration: CjDeclaration) =
            declaration.parentsWithSelf.filterIsInstance<CjDeclaration>().findLast { it !is CjTypeStatement }
                ?: declaration

        fun createForDeclaration(
            declaration: CjDeclaration,
            trace: BindingTrace,
            languageVersionSettings: LanguageVersionSettings
        ) {
            val visitorOwner = topMostNonClassDeclaration(declaration)
            if (trace.get(BindingContext.PRELIMINARY_VISITOR, visitorOwner) != null) return
            trace.record(
                BindingContext.PRELIMINARY_VISITOR, visitorOwner,
                PreliminaryDeclarationVisitor(visitorOwner, languageVersionSettings)
            )
        }

    }
}
